Constructing schemes of various kind of mechanical equipment.
Consider, for example, ball ring mill. The work includes three parts:
1. Purpose and scope the use of the machine, the device and its principle of operation.
2. Drawing diagrams of the ball ring mills.
3. Create a three-dimensional model of ball ring mill.
Mid-range mill mainly used for grinding materials of low and middle strength, for example, lump lime, gypsum, dry clay, graphite, kaolin, coal. The material in these mills is ground between balls or rollers and a grinding ring or plate according to the principle of crushing.
The mills are unloaded pneumatically - flow of air that blow stuff up.
All types sredneplodnyh mills work effectively in the grinding of soft and medium strength non-abrasive materials. The application of these mills for grinding hard abrasives is not recommended due to rapid wear of expensive balls and rings.
Depending on performance, the diameter of the balls varies from 170 to 270 mm, a rotational frequency of 100 to 300 rpm.
Ring grinding mechanism of the ball mill (Fig. 9.1) consists of 6 balls clamped between two rings: the lower rotating ring 7 and the upper fixed 5.
The balls are actuated from the lower ring 7 and, under pressure from three or four springs which has passed through the top ring 5 and fastened him thrust ring. The spring pressure can be adjusted pressure with the nut.
Pressure is evenly distributed between the springs, whereby the wear of the balls of the mill is uniform.
The lower ring 8 attached to the support plate, which is attached on top of rotating together with the plate separator 3 in the form of a truncated cone with blades.
The crushed material from the feeder 4 is poured on the tray to the chamber of the mill between the plate and the balls and is thrown by centrifugal force to the periphery where it is ground between balls and rings
Fig. 9.1 - Diagram of a ball ring mill with a centrifugal separator through passage type:
1 - pipe for the exit of the mixture; 2 - blades for regulating the fineness of grinding; 3 - separator; 4 - disk feeder; 5 - upper stationary ring; 6 - ball; 7 - lower rotating ring; 8 - gearbox.
Then the crushed material is forced into the outer cavity of the mill, from where it is carried out by a stream of air into the separator 3. Air is pumped by a fan through the windows. In the separator blades, the dusty air stream is twisted, after which the largest particles inside the separator body due to inertia fall out of the stream, fall down the wall and fall back into the mill in the center of the grinding table. Smaller dust remains in the stream, is carried out from the separator and is directed through the dust pipes to the burners. All separator blades are rotary and have a synchronized drive, so the grinding fineness can be adjusted.
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The mill is driven by an electric motor through a V-belt drive. The maximum size of pieces of crushed material should not exceed 25-38 mm.
Benefits:
• Compact design;
• High profitability (at the level of hammer mills).
Disadvantages:
• The complexity of the design;
• Sensitivity to the ingress of pieces of metal into the mill and high costs for the repair of rolls and elements of the grinding table;
• High aerodynamic drag of the mill (6500 PA);
• Greater fuel limitations.
9.2.Drawing the circuit of a ball ring mill.
9.3. Creating a three-dimensional model of a ball ring mill.
Control questions
1. What is a primitive in AutoCAD system?
2. Methods of coordinate setting.
3. What are the options of the command CIRCLE (CIRCLE), you know?
4. What are the options of the command ARC (АRС) you know? How does the construction of the arc from the positive or negative angle, chord, radius?
5. What is the difference between the commands line and polyline(LINE,PLINE)?
6. Square loops.
7. How to draw inscribed, described polygons and a polygon for the known side?
8. The isometric type of the binding modes of drawing.
9. What is the ROUTE and what commands it is implemented?
10. Multiple copying.
11. The drawing command of the text.
12. What variables are used to change the type and size of the marker?
13. The choice of the limits of drawing.
14. Features team BLOCK (BLOCK).
15. What are command options SHOW (ZOOM)?
16. The main difference between modes ОSNAP, OTRACK, POLAR.
17. What features in the construction of facets and interfaces.
18. The purpose of the dialog Manager object properties.
19. The purpose of the Toolbox ORBIT.
20. Toning.
21. How to draw axial and the dashed lines and circles? How to change the size of the axes?
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22. What command allows you to hatch the area? What styles of hatching do you know?
23. The Toolbox dimensioning.
24. How to dimension from one base? How can I dimension serial dimension chain?
25. Which team provides the input angular size? As to the output of the degree symbol and the dimension text?
26. Placing a diametrical, radial, arc length dimension.
27. Application features callouts.
28. What are the main solid elements.
29. Three-dimensional operation.
30. Three-dimensional types, the main types of three-dimensional surfaces.
Application
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